The first thing you have to do is creating a Twitter Application here https://apps.twitter.com/
Once you’re logged in click on the “Create New App” button.
New Application Data:
It’s really important to set the right Call Back URL.
Getting the Customer Key & Consumer Secret:
These two values are needed in order to make the Twitter Authorization process works correctly.
Make sure your give your Twitter Application read and write permissions.
Login to your WP Dashboard, then click on the Users Ultra Settings – Social tab. You will need to copy/paste the Consumer Key and Consumer Secret in the Twitter configuration section.